<!DOCTYPE html>
<html>

  <body>

  <script type="text/javascript">

  function Car(sColor,iDoors,iMpg) {
    this.color = sColor;
    this.doors = iDoors;
    this.mpg = iMpg;

    this.showColor = function() {
      document.write(this.color);
    };
  }

  var oCar1 = new Car("red",4,23);
  var oCar2 = new Car("blue",3,25);

  oCar1.showColor();  //output red
  document.write("<br />")
  oCar2.showColor();  //output blue

  </script>

  </body>

</html>
